The MasterBall is located in Team Magma's base in Lilycove City.
Team Magma Hideout
Pokemon ruby's version IS Pokemon ruby.
you have to beat the game and talk to the professor and he will give you one
First become Pokemon champion now latios can be found on every route so look everywhere! When you find it i highly suggest using the masterball.
No sorry
With a Masterball
Lilycove lottery
you cant find him in Pokemon ruby instead you find may.
From fortree city go to lilycove and go to magma or aqua base.Before going to Maxie or Archie go another way. There u will find nugget and masterball and voltorbs
there is no cerulean cave in ruby
There is no way to buy any masterballs in any Pokemon version. However, you can have a Pokemon from another version trade over a masterball, and in ruby, sapphire, and emerald, you can get a second masterball at the lilycove dept. store lottery.
There is only one masterball in yellow.